如何在运行时从JTextArea运行/编译Java代码？

Question

我有一个JInternalFrame,它绘有BufferedImage并包含在JFrame的JDesktopPane中.我还有一个JTextArea,我想编写一些java代码(函数),它将当前JInternalFrame的绘制BufferedImage作为输入,在对此输入进行一些操作后,它返回另一个操作的BufferedImage,它再次使用新的操作Image绘制JInternalFrame.

操纵JTextArea的java代码: -

public BufferedImage customOperation(BufferedImage CurrentInputImg) 
{    
    Color colOld;
    Color colNew;

    BufferedImage manipulated=new BufferedImage(CurrentInputImg.getWidth(),CurrentInputImg.getHeight(),BufferedImage.TYPE_INT_ARGB);

    // make all Red pixels of current image black 
    for(int i=0;i< CurrentInputImg.getWidth();i++) {
        for(int j=0;j< CurrentInputImg.getHeight(),j++) { 
            colOld=new Color(CurrentInputImg.getRGB(i,j));
            colNew=new Color(0,colOld.getGreen(),colOld.getBlue(),colOld.getAlpha());
            manipulated.setRGB(i,j,colNew.getRGB());
        } 
    }

    return manipulated;
}

如何在运行时运行/编译此JTextArea Java代码并获取一个新的操作图像以便在JInternalFrame上绘制？

这是我的主要课程:

(这个类不是实际的,但是我为你创建了它,用于包含JTextArea,JInternalFrame,Apply Button的基本接口)

import java.awt.*;    
import java.awt.event.*;    
import javax.swing.*;    
import javax.swing.event.*;    
import javax.swing.JInternalFrame;    
import javax.swing.JDesktopPane;    
import java.awt.image.*;    
import javax.imageio.*;    
import java.io.*;    
import java.io.File;    
import java.util.*;

class MyCustomOperationSystem extends JFrame    
{

    public JInternalFrame ImageFrame;     
    public BufferedImage CurrenFrameImage;

    public MyCustomOperationSystem() {
        setTitle("My Custom Image Operations");
        setSize((int)Toolkit.getDefaultToolkit().getScreenSize().getWidth(), (int)Toolkit.getDefaultToolkit().getScreenSize().getHeight());

        JDesktopPane desktop=new JDesktopPane();
        desktop.setPreferredSize(new Dimension((int)Toolkit.getDefaultToolkit().getScreenSize().getWidth(),(int)Toolkit.getDefaultToolkit().getScreenSize().getHeight()));

        try {
            CurrenFrameImage=ImageIO.read(new File("c:/Lokesh.png"));
        }catch(Exception exp) {
            System.out.println("Error in Loading Image");
        }

        ImageFrame=new JInternalFrame("Image Frame",true,true,false,true);
        ImageFrame.setMinimumSize(new Dimension(CurrenFrameImage.getWidth()+10,CurrenFrameImage.getHeight()+10));
        ImageFrame.getContentPane().add(CreateImagePanel());
        ImageFrame.setLayer(1);
        ImageFrame.setLocation(100,100);
        ImageFrame.setVisible(true);  
        desktop.setOpaque(true);
        desktop.setBackground(Color.darkGray);
        desktop.add(ImageFrame);
        this.getContentPane().setLayout(new BorderLayout());
        this.getContentPane().add("Center",desktop);
        this.getContentPane().add("South",ControlPanel());
        pack();
        setVisible(true);
    }

    public JPanel CreateImagePanel() {
        JPanel tempPanel=new JPanel() {
            public void paintComponent(Graphics g) {
                g.drawImage(CurrenFrameImage,0,0,this);
            }
        };

        tempPanel.setPreferredSize(new Dimension(CurrenFrameImage.getWidth(),CurrenFrameImage.getHeight()));
        return tempPanel;
    }

    public JPanel ControlPanel() {
        JPanel controlPan=new JPanel(new FlowLayout(FlowLayout.LEFT));
        JButton customOP=new JButton("Custom Operation");

        customOP.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent evnt) {
                JFrame CodeFrame=new JFrame("Write your Code Here");
                JTextArea codeArea=new JTextArea("Your Java Code Here",100,70);
                JScrollPane codeScrollPan=new JScrollPane(codeArea,ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
                CodeFrame.add(codeScrollPan);
                CodeFrame.setVisible(true);
            }
        });

        JButton Apply=new JButton("Apply Code");

        Apply.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent event){

             // What should I do!!! Here!!!!!!!!!!!!!!!

            }
        });

        controlPan.add(customOP);
        controlPan.add(Apply);
        return controlPan;
    }

    public static void main(String s[]) {
        new MyCustomOperationSystem();
    }
}

注意:在上面的类中,JInternalFrame(ImageFrame)是不可见的,即使我已声明它可见.因此,在编译和运行上述类时,ImageFrame不可见.您必须在运行之前识别此问题.

Answer 1

看一下Java 6 Compiler API